Hetrosis and combining ability analysis in Indian mustard (Brassica juncea (L.) Czern and Coss.)

Abstract

A study of Diallel analysis excluding reciprocal cross, of seven parents was carried out to identify high heterotic crosses and their relationship in terms of general and specific combining ability (GCA and SCA) in Indian mustard in year 2015-16 and 2016-17. Out of 21 specific crosses, highest economic heterosis was observed in case of five crosses viz ; NRCHB-101 X Pusa M-21 (9.56), Urvashi X Pusa Bold (9.03), NRCDR-2 x Urvashi (8.69), Maya X Pusa Bold (8.65) and Maya X NRCDR-2 (8.30). ANOVA study of GCA variances significant for all the characters and SCA variances significant for nine characters except in case of days to maturity, plant height and biological yield per plant. The ratio of GCA and SCA variances were below unity in Six characters Out of twelve characters,. Urvashi, Pusa Bold are the best parent for almost all traits as their GCA and per se performance are highest. Maya X NRCDR-2, Maya x Urvashi, Maya x Pusa Bold, NRCDR-2 X Urvashi, NRCHB-101 X Pusa M-21 and Urvashi X Pusa Bold showed high per se performance as well as SCA effects. The above best parent and best crosses can be used in hybridization and heterosis breeding respectively.